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Positive active material for rechargeable lithium battery and rechargeable lithium battery

a lithium battery and active material technology, applied in the direction of non-aqueous electrolyte accumulator electrodes, cell components, alkaline accumulators, etc., can solve the problems of unsatisfactory electrodes, and achieve excellent high-rate charge and discharge and cycle-life characteristics

Active Publication Date: 2013-10-31
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is directed toward a positive electrode for a rechargeable lithium battery that has excellent high-rate capability and cycle-life characteristics. The electrode includes activated carbon with the same particle size as the positive active material. This results in a battery that can charge and discharge quickly, and has a long life span.

Problems solved by technology

However, such electrodes are not satisfactory yet due to the characteristics of the active material itself.

Method used

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  • Positive active material for rechargeable lithium battery and rechargeable lithium battery
  • Positive active material for rechargeable lithium battery and rechargeable lithium battery
  • Positive active material for rechargeable lithium battery and rechargeable lithium battery

Examples

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Effect test

example 1

[0070]85 wt % of LiCoO2 having an average particle diameter of 6.6 μm, 5 wt % of activated carbon having an average particle diameter of 6.8 μm (pitch-based, Kuraray Chemical Co.), 4 wt % of an acetylene black (Denka Chemicals Korea Co. Ltd.) conductive material, and 6 wt % of a polyvinylidene fluoride binder were mixed in an N-methylpyrrolidone solvent, preparing a positive active material slurry.

[0071]The positive active material slurry was coated on a 15 μm-thick Al foil, dried at 100° C., and compressed, fabricating a positive electrode having an active mass (positive active material layer) density of 2.6 g / cc.

[0072]Additionally, a negative active material slurry was prepared by mixing 85 wt % of a soft carbon (Hitachi Ltd.) negative active material having an average particle diameter of 10 μm, which was an amorphous carbon, 5 wt % of acetylene black (Denka Chemicals Korea Co. Ltd.), and 10 wt % of a polyvinylidene fluoride binder were mixed in an N-methylpyrrolidone solvent.

[00...

example 2

[0076]A rechargeable lithium battery cell was fabricated according to the same method as Example 1 except for mixing 85 wt % of LiCoO2 having an average particle diameter of 6.4 μm, 5 wt % of activated carbon (pitch-based, Kuraray Chemical Co.) having an average particle diameter of 6.65 μm, 4 wt % of an acetylene black (Denka Chemicals Korea Co. Ltd.) conductive material, and 6 wt % of a polyvinylidene fluoride binder in an N-methylpyrrolidone solvent to prepare a positive active material slurry.

example 3

[0077]A rechargeable lithium battery cell was fabricated according to the same method as Example 1 except for mixing 85 wt % of LiCoO2 having an average particle diameter of 6.6 μm, 5 wt % of activated carbon (pitch-based, Kuraray Chemical Co.) having an average particle diameter of 8.08 μm, 4 wt % of an acetylene black (Denka Chemicals Korea Co. Ltd.) conductive material, and 6 wt % of a polyvinylidene fluoride binder in an N-methylpyrrolidone solvent to prepare a positive active material slurry.

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Abstract

A positive electrode for a rechargeable lithium battery includes a positive active material and activated carbon, wherein an average particle diameter of the activated carbon is about 100% to about 160% relative to 100% of an average particle diameter of the positive active material.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of Korean Patent Application No. 10-2012-0045479 filed in the Korean Intellectual Property Office on Apr. 30, 2012, the entire contents of which are incorporated herein by reference.BACKGROUND[0002]1. Field[0003]A positive electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same are disclosed.[0004]2. Description of the Related Art[0005]In recent times, due to reductions in size and weight of portable electronic equipments, and popularization of portable electronic devices, researches on rechargeable lithium batteries having high energy density as power sources for portable electronic devices have been actively made. Rechargeable lithium batteries include a negative electrode, a positive electrode, and an electrolyte, and generate electrical energy by oxidation and reduction reactions when lithium ions are intercalated / deintercalated in the positi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/133H01M10/056
CPCH01M4/364H01M4/525H01M4/587H01M10/0525H01M2004/021Y02E60/10H01M4/133H01M4/1393H01M4/583H01M4/621
Inventor AN, JUNG-WOOSHEEM, KYEU-YOONISHIDA, SUMIHITO
Owner SAMSUNG SDI CO LTD
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